Rusty Bertrand on Nostr: In the cold winters of northern Europe, houses were difficult to heat. Then some ...

In the cold winters of northern Europe, houses were difficult to heat.

Then some forgotten craftsman started building beds, inside closets. The beds had one or two compartments, which since the 16th century protected northerners from the ice after the fire went out.

It spread accros Europe, insulation was born.
https://en.m.wikipedia.org/wiki/Box-bed